Drive for rotary mechanical seals with o rings



Feb. 12, 1952 G, MONTGOMERY 2,585,154

DRIVE FOR ROTARY MECHANICAL SEALS WITH "0" RINGS Filed Nov. 26, 1947 INVENTOR Patented Feb. 12, 1952 muvs FOB ROTARY uacnmrou. SEALS wrrn o arses George E. Montgomery, Chicago, IiL, aslignor to 1 Crane Packing Company, Chicago, 111., a corporation of Illinois Application November 26, 1941, Serial no. 73532:

This invention relates to mechanical rotary seals for pumps or the like wherein a rigid sealing washer is used to effect a seal on a radial plane.

The object of this invention is to provide a seal of the mechanical type for rotary apparatus wherein the seal utilizes an endless ring having a circular radial cross-section and commonly known as an O ring, to effect a seal between the washer and one of the relatively rotatable ele-.

ments to be sealed, and in which separate-means are provided to prevent relative rotation between the washer and the element to which it j is sealed, said separate means being of simple construction and serving additionally to confine the O ring to a predetermined location relative to the washer.

The stated object of this invention and other objects will become apparent from the following detailed description when taken together with the accompanying drawings, in which Fig. 1 is a quarter-sectional view of a rotary mechanical seal embodying the features ofthis invention; Y

Fig. 21s a fragmentary elevation taken alongline 2-2 of Fig. 1 showing the means for preventing relative rotation between the washer and the element to which it is sealed.

Referring now to the drawings for a detailed description of the invention, there is shown a, shaft l having an enlarged stepped portion H passing through an opening l2 in housing 13. Said housing has a recess Ii forming with shaft III a seal chamber IS. The left-hand end of chamber l5 as viewed in Fig. 1 is defined by a closure-plate l5 which is bolted or otherwise secured to housing l3. A gasket i1 serves to effect a fluid-tight seal between housing It and closure-plate IS.

A recess 18 is formed in plate 16 to receive an endless ring IQ of resilient deformable material such as rubber. either natural or synthetic. or a combination of the two, which supports a seat ring 20 of rigid material. Said ring 20 is of such diameter as to cause ring l9 to be compressed into recess l8 and form a fluid-tight seal between seat ring 20 and closure-plate l6.

2 Claims. (Cl- 288-1115) disposed surface 24 which is ground and lapped so as to be perfectly smooth to form a fluid-tight running flt with-seal seat 20. Washer 22 has a recess 25 adjacent shaft Ill into which is compressed an endless ring 26 of rubber, eithernatural or synthetic, or a combination of the two, said ring having a circular radial crosssection and known commonly as an O ring. It is understood that other materials can be substituted for rubber provided they are resilient and 'deformable.- The dimensions of recess 25 with relation to the dimensions of O ring 25 are such that the ring is under initial compression when installed into the recess.

Ring 25 provides a fluid-tight seal between washer 22 and shaft I 0 and at the same time permits washer. 22 to move axially and to some extent radially relative to shaft l0.

In order to relieve O ring 25 of any torque load that might be imposed upon it by virtue of the I resistance of washer 22 to movement with shaft The seat ring 20 has a radially disposed surface 2| which is suitably ground and lapped so as to be perfectly flat and smooth. Seat ring 20 is free to float or otherwise adjust its position relative to closure-plate l6 as dictated by the seal hereinafter to be described.

Cooperating with seat ring 20 is a washer 22 having a laterally extending rib 23 facing seat ring 20, rib 23 being provided with a radially on washer 22. The reaction of spring is provided, the driving II, a driving means being utilized to prevent means at the same time ring 25 from working itself out of recess 25. Thedriving means is comprised of a [ring 21 preferably of resilient deformable material, which is pressed upon shaft III by a band 25 of rigid material. Said band has a flange 22 extending radially inwardly along the left-hand edge (Fig. l) of ring 21 so that when ring 21 is pushed upon shaft ID on the left-hand end thereof as viewed in Fig. 1, flange 28 will prevent ring 21 from sliding over the band. Said band is provided with one or more radially outwardly extending lugs having a somewhat semi-circular form as shown in Fig. 2 and extending into axially disposed notches ii in washer 22. Lugs 20 prevent washer 22 from rotating relative to the flange 25 but permit the washer to move axially in response to wear or axial vibration. When the seal is assembled upon shaft Hi, the ends 22 of notches 3| strike the end 33 of lugs 20 before ring 25 can be compressed between washer 22 and flange." and thus the axial dimension of the space in which ring 25 operates is determined.

It will be observed that when the seal is installed, flange 29 serves to define the space in which ring 28 operates and thus prevents ring 25 from working its way out of recess 25.

Washer 22 is held against ring 20 by means of a spring 35 which is telescoped over the outside of surface of washer 22 and transmits its pressure through a washer 25 to a shoulder 25 formed 34 is taken is illustrative of preferred embodiments of this invention and that the scopeofthe invention is not to be limited thereto, but is to be determined by the appended claims.

What is claimed is:

1. A device for effecting a fluid-tight seal between relatively rotatable elements comprising a sealing washer encircling one of the elements and a resilient deformable sealing ring compressed radially by the washer against the said one element, said device being characterized by means for preventing relative rotation between the washer and said one element comprising a band adjacent the sealing ring, a resilient ring compressed solely in a radial direction between the band and said one element to secure the band to the said element frictionally, a connection between the band and washer providing relative axial movement but preventing relative rotational movement between the band and washer, and a radially inwardly disposed flange on the band adiacent the sealing ring and limiting axial movement of the said sealing ring in the direction of the band.

4 2. A device for effecting'a seal between a shaft and a housing for the shaft wherein a sealing washer encircles the shaft and is provided with a recess adjacent the shaft, and an endless sealing ring of flexible deformable material is located in the recess and compressed between the washer and shaft to form a fluid-tight seal, said device being characterized by means for preventing relative rotation between the washer and shaft, comprising a band located in the recess adjacent the ring, means compressed solely in a radial I direction between the band and shaft for driving the band frictionally from the shaft, and lugs on the band, said washer having axially disposed notches in the recess into which the lugs extend.

GEORGE E. MONTGOMERY.

REFERENCES CITED The followins references are of record in the file of this patent:

UNITED STATES PATENTS 

